I'll give it a week off after today, and see how it goes. Fortunately, I don't have a lot of stuff with Bert's unusual chording. I usually put the knots in my shoulder, but this is the first case of anything in my hand( and its only a pain if I go for a reach with my arm, or stretch first thing in the morning). I suppose, having cracked it, I can let it go and try for easier chordings in future!